From MagicaVoxel Community Wiki
[3:10 PM] shrubland_: What does LDR do exactly?[3:16 PM] Ocha: The the biggest difference happens between 0 & 1. Because 0 = none, and 1 is actually the lowest setting.
[3:14 PM] Ocha: Low dynamic range
[3:15 PM] Ocha: Sometimes when you crank the light up, the voxel becomes all white. LDR help retain the color the emittion source has.